CN106300993A - Brachium pontis multiplexing high-efficiency rate Full-bridge phase-shift device before and after one - Google Patents

Abstract

The invention discloses brachium pontis multiplexing high-efficiency rate Full-bridge phase-shift device before and after one, including Full-bridge phase-shift unit；Described full-bridge shifts to the advanced arm that converter unit includes being made up of, the lagging leg being made up of the second device for power switching and the 4th power switching device series the first device for power switching and the 3rd power switching device series；Described advanced arm is in parallel with described lagging leg, and described advanced arm, lagging leg are all connected with full-bridge rectification module；Described Full-bridge phase-shift unit and the first LLC half bridge resonant share advanced arm；Described Full-bridge phase-shift unit and the second LLC half bridge resonant share lagging leg.First resonant LLC converter of the present invention helps advanced arm to realize ZVS, make the voltage stress clamper of secondary commutation diode of Full-bridge phase-shift device at a less voltage simultaneously, and make Full-bridge phase-shift device reduce at the circulation of freewheeling period, effectively reduce duty-cycle loss phenomenon；The peak efficiency of changer can be to more than 98%.

Description

Brachium pontis multiplexing high-efficiency rate Full-bridge phase-shift device before and after one

Technical field

The present invention relates to a kind of soft switch transducer, specifically one and realize gamut Sofe Switch, high efficiency entirely Bridge phase-shifting transformer, it is adaptable to high-power charger.

Background technology

Along with social development, the application of energy-storage battery power-supply system is more and more extensive, such as electric automobile energy-storage battery electricity Source, the high-power standby in island energy-storage battery power-supply system etc..For improving energy utilization rate, lower carbon emission, increase economic efficiency, Charging power device for the charging of these energy-storage battery power-supply systems should possess the highest energy conversion efficiency.

Full-bridge phase-shift device is used widely at present in high-power high-frequency switch power-supply device.But traditional is complete It is narrow to there is lagging leg ZVS switching range in bridge phase-shifting transformer, and primary circulation loss is big, duty-cycle loss is obvious, secondary commutation two Pipe upper voltage ring in pole is serious, and the shortcomings such as voltage stress is big, these shortcomings directly affects the raising of energy conversion efficiency.

LLC resonance topological is a kind of circuit topology the most frequently used in current high frequency switch power, has good ZVS special Property, secondary commutation diode realizes ZCS, and voltage stress is little, and output need not filter inductance, reduces the body of loss and changer Long-pending, therefore obtain electromagnetic interference little, the advantage that efficiency is high.But LLC resonant converter is to regulate output by regulating frequency Voltage, once the resonant frequency point of resonant frequency deviation LLC resonator cavity is relatively big, and the efficiency of changer can reduce, and in big merit Needing output voltage to change in a wider scope in the application of rate charger, therefore LLC resonant converter is in this respect Existing defects.

For improving the energy conversion efficiency of changer, people's combination to Full-bridge phase-shift device Yu LLC resonant converter Numerous studies are carried out.Document " Zero-Voltage-Switching PWM Resonant Full-Bridge Converter With Minimized Circulating Losses and Minimal Voltage Stresses of Bridge Rectifiers for Electric Vehicle Battery Chargers " propose a kind of Full-bridge phase-shift device and half Bridge LLC resonant converter shares the circuit of lagging leg, and conversion efficiency is greatly improved.

So, for the research of compound mode of Full-bridge phase-shift device and LLC resonant converter to improving changer Energy conversion efficiency has realistic meaning.

Summary of the invention

To be solved technical problem is that of the present invention, for above-mentioned the deficiencies in the prior art, it is provided that brachium pontis multiplexing before and after one High efficiency Full-bridge phase-shift device, solves advanced arm and lagging leg in prior art and can not realize the problem of ZVS by full-load range, The problem solving the voltage ring of secondary commutation diode, reduces voltage stress, effectively reduces phase-shifting full-bridge power inverter master Loop circulation loss, it is adaptable to the charger of large-capacity battery and the relevant occasion needing high output voltage.

For solving above-mentioned technical problem, the technical solution adopted in the present invention is: before and after one, brachium pontis multiplexing high-efficiency rate is complete Bridge phase-shifting transformer, including Full-bridge phase-shift unit；Described full-bridge is shifted to converter unit and is included by the first device for power switching The advanced arm constituted with the 3rd power switching device series, by the second device for power switching and the 4th power switching device series structure The lagging leg become；Described advanced arm is in parallel with described lagging leg, and described advanced arm, lagging leg are all connected with full-bridge rectification module； Described Full-bridge phase-shift unit and the first LLC half bridge resonant share advanced arm, described first half-bridge logical link control (LLC) resonant conversion Device secondary output use full bridge rectifier, the cold end of described first LLC half bridge resonant secondary commutation circuit with The secondary commutation circuit cold end of Full-bridge phase-shift device is connected, the first LLC half bridge resonant secondary commutation circuit Hot end is connected by a resonant capacitance with described full-bridge rectification module hot end；Described Full-bridge phase-shift unit with Second LLC half bridge resonant shares lagging leg, and described second LLC half bridge resonant secondary uses all wave rectification electricity Road, provides DC source for fanning hot DC fan.

Described advanced arm, the collector of four device for power switching of lagging leg are all parallel with emitter stage/source electrode For improving the Absorption Capacitance of device for power switching turn-off characteristic, and the parameter of four electric capacity is identical.

Pass sequentially through capacitance between described advanced arm with described full-bridge rectification module, main power transformer is connected.

With the first LLC half bridge resonant that advanced arm shared by Full-bridge phase-shift device, its secondary output uses full-bridge Rectification, the cold end of the first LLC half bridge resonant secondary commutation circuit is electric with the secondary commutation of Full-bridge phase-shift device Road cold end is joined directly together, the hot end of the first LLC half bridge resonant secondary commutation circuit and Full-bridge phase-shift The secondary commutation circuit hot end of device passes through a resonant capacitance C_reIt is connected, utilizes the primary leakage inductance L of main power inverter T_lk With resonant capacitance C_reResonance, it is achieved the quick zero setting of changer primary circulation, secondary commutation diode voltage clamper, resonant energy stores up It is stored to C_O2In；During afterflow, it is stored in C_reAnd C_O2Energy be delivered to outfan by outputting inductance Lo.

With the second LLC half bridge resonant that lagging leg shared by Full-bridge phase-shift device, its secondary employing all wave rectification Circuit, while for fanning hot DC fan offer 48V DC source, helps lagging leg device for power switching to realize ZVS.

Compared with prior art, the had the beneficial effect that present invention of the present invention passes through the first half-bridge logical link control (LLC) resonant conversion The advanced arm of Full-bridge phase-shift device shared by device, and the resonance current of LLC resonator cavity can help full-bridge phase shifting circuit to complete electricity Hold the resonance of C1, C3, it is achieved the ZVS switch of advanced arm, be conducive to reducing switching loss.The primary leakage inductance of main power inverter T L_lkWith resonant capacitance C_reResonance, resonant capacitance terminal voltage and output capacitance C of the first LLC half bridge resonant_O2Terminal voltage it Jointly act on the secondary of changer T, help Full-bridge phase-shift device to make zero rapidly at freewheeling period circulation, reduce full-bridge The conduction loss of phase-shifting transformer, and transmit energy by outputting inductance Lo to outfan at freewheeling period, improve energy and pass Pass efficiency and be conducive to improving transducer effciency.The cooling fan that second LLC half bridge resonant is equipment provides electric energy Meanwhile, helping lagging leg to realize ZVS in full-load range, while improve the reliability of equipment, efficiency is also improved.

Accompanying drawing explanation

Fig. 1 is the circuit topological structure figure of the present invention；

Fig. 2 is the main converter secondary equivalent circuit diagram of the present invention；

Fig. 3 show Q_SThe equivalent circuit of (effective duty cycle device) under conducting state；

Fig. 4 show Q_SThe equivalent circuit of (effective duty cycle device) under cut-off state.

Detailed description of the invention

As it is shown in figure 1, the present invention includes Full-bridge phase-shift unit 1, share the of advanced arm with Full-bridge phase-shift device One LLC half bridge resonant unit 2, with the second LLC half bridge resonant list that lagging leg shared by Full-bridge phase-shift device Unit 3.Device for power switching Q1～Q4 in Full-bridge phase-shift unit 1 constitutes four brachium pontis of Full-bridge phase-shift device, D1～ D4 is the body diode of device for power switching, C1～C4 is for being connected in parallel on device for power switching colelctor electrode (drain electrode) and emitter stage (source Pole) between Absorption Capacitance, wherein Q1, Q3 constitute advanced arm, Q2, Q4 constitute lagging leg, C_gFor capacitance, T is main power Transformator, L_lkIt is the primary leakage inductance of transformator T, D_O1～D_O4Constitute secondary full-bridge rectification, L_OFor output inductor.Phase shift Full-bridge converter and the first LLC half bridge resonant collectively form power transmission path, and wherein Full-bridge phase-shift device is main Power transmission path.

With the first LLC half bridge resonant unit 2 that Full-bridge phase-shift unit shares advanced arm, it is operated in fixing frequency Under rate state, the resonant frequency of its resonator cavity is equal to the switch operating frequency of the power device of Full-bridge phase-shift device, resonator cavity Electric current meets and realizes advanced arm ZVS under idle condition:

$\frac{1}{2}(L_{m1}+L_{r1})\·I_{Lm-peak1}^2\≥\frac{1}{2}{C}_{HB}{V}_{in\left(max\right)}^2---\left(1\right)$

I in formula_Lm-peak1It is the first half-bridge logical link control (LLC) resonant chamber exciting current peak value, C_HBFor brachium pontis parallel connection Absorption Capacitance:

C_HB=C₁=C₂=C₃=C₄ (2)

The cold end of the first LLC half bridge resonant secondary commutation circuit and the secondary commutation of Full-bridge phase-shift device Circuit cold end is joined directly together, and the hot end of the first LLC half bridge resonant secondary commutation circuit becomes with full-bridge phase shifting The secondary commutation circuit hot end of parallel operation passes through a resonant capacitance C_reIt is connected, C_O2It it is the first LLC half bridge resonant The electric capacity of the filtering after level rectification, its capacitance is much larger than C_re.Resonant capacitance C_reWith the leakage inductance resonance of transformator T, resonant frequency For:

$T_r=2\mathrm{\π}\sqrt{{(n_1/n_2)}^2{L}_{lk}{C}_{re}}=T_s---\left(3\right)$

In formula, T_SWorking cycle for Full-bridge phase-shift device device for power switching.

With the second LLC half bridge resonant unit 3 that lagging leg shared by Full-bridge phase-shift device, the resonance of its resonator cavity Frequency equal to the switch operating frequency of power device of Full-bridge phase-shift device, cavity current meet realize under idle condition stagnant Postbrachium ZVS:

$\frac{1}{2}(L_{m2}+L_{r2})\·I_{Lm-peak2}^2\≥\frac{1}{2}{C}_{HB}{V}_{in\left(max\right)}^2---\left(4\right)$

I in formula_Lm-peak2It is the second half-bridge logical link control (LLC) resonant chamber exciting current peak value, C_HBFor brachium pontis parallel connection Absorption Capacitance.

Shown in Fig. 2, for the equivalent circuit that power transmission path is secondary.V_Co2It it is the first LLC half bridge resonant filtered electrical Voltage in appearance, because of C_O2Capacitance is much larger than C_re, and the first half-bridge converter only transmits energy at freewheeling period to outfan, institute With V_Co2A constant pressure source can be regarded as within a cycle.Fig. 3 show Q_SUnder conducting state (effective duty cycle device) etc. Effect circuit, while power is delivered to outfan by outputting inductance, by resonant capacitance C_reTo C_O2Charging.Fig. 4 show Q_S The equivalent circuit of (effective duty cycle device) under cut-off state, outputting inductance electric current is through overload, C_O2、C_reForm continuous current circuit, Exist at C_O2、C_reIn energy be delivered to outfan by outputting inductance Lo, compare the traditional approach of only outputting inductance, In the case of identical ripple, the volume of outputting inductance and inductance value can reduce.

By presented above, proposed by the invention before and after brachium pontis multiplexing high-efficiency rate Full-bridge phase-shift device have following excellent Point:

(1) four brachium pontis device for power switching of full-bridge phase shifting can realize ZVS in full-load range, reduces switch Loss.

(2) the ZCS achieving Full-bridge phase-shift device output commutation diode turns off, and reduces output commutation diode Switching loss.

(3) leakage inductance L of transformator T_lkWith electric capacity C_reResonance, stores electricity by the energy in leakage inductance during effective duty cycle Hold C_O2、C_reIn, during afterflow, electric capacity C_O2、C_reOn voltage superposition, make Full-bridge phase-shift device primary current make zero rapidly, Reduce circulation loss and duty-cycle loss, provide freewheeling path for outputting inductance simultaneously, be stored in electric capacity C_O2、C_reAnd inductance Energy in Lo is delivered to outfan, reduces inductance value and the volume of outputting inductance, reduces the loss brought because of outputting inductance.

(4) lagging leg provides energy for cooling system, easy and also efficiently.

Experiment shows, when using the technical program, four device for power switching of changer all achieve ZVS switch, Big conversion efficiency has brought up to more than 98%.

Claims (3)

1. brachium pontis multiplexing high-efficiency rate Full-bridge phase-shift device before and after a kind, it is characterised in that include Full-bridge phase-shift unit；Institute State full-bridge and shift to the advanced arm that converter unit includes being made up of the first device for power switching and the 3rd power switching device series, by The lagging leg that second device for power switching and the 4th power switching device series are constituted；Described advanced arm is with described lagging leg also Connection, described advanced arm, lagging leg are all connected with full-bridge rectification module；Described Full-bridge phase-shift unit and the first half-bridge LLC are humorous Advanced arm shared by the changer that shakes, and described first LLC half bridge resonant secondary exports and uses full bridge rectifier, and described first The cold end of LLC half bridge resonant secondary commutation circuit and the secondary commutation circuit cold end of Full-bridge phase-shift device Being connected, the hot end of the first LLC half bridge resonant secondary commutation circuit leads to described full-bridge rectification module hot end Cross a resonant capacitance to be connected；Described Full-bridge phase-shift unit and the second LLC half bridge resonant share lagging leg, described Second LLC half bridge resonant secondary uses full-wave rectifying circuit, provides DC source for fanning hot DC fan.

The most according to claim 1 before and after brachium pontis multiplexing high-efficiency rate Full-bridge phase-shift device, it is characterised in that described in advance Arm, collector and the emitter stage/source electrode of four device for power switching of lagging leg are all parallel with for improving power switch The Absorption Capacitance of device turn-off characteristic, and the parameter of four electric capacity is identical.

The most according to claim 1 before and after brachium pontis multiplexing high-efficiency rate Full-bridge phase-shift device, it is characterised in that described in advance Pass sequentially through capacitance between arm with described full-bridge rectification module, main power transformer is connected.